Frame skip is kinda a shitty word for it since the effect actually given off looks like micro stutters but it is a frame lost and yes some apps do not do this such as OBS but more often than not it goes unnoticed plus it isn't perfect but just a bonus. Fraps pulling down the frame rate is it frame rate matching and it isn't really without your permission since you do set the rate at which it records so if you have the extra overhead you can up the rate till your pc falls to its knees. As for being a resource hog it depends on the machine for example fraps takes less resources (excluding disk space) recording lossless at 60fps than OBS with the same rate and high bitrate which is just milking my cpu/gpu for its compression but that's in my case it's not to say it doesn't go the opposite.Although comparing the two is a tad bit like comparing apples to oranges as one is intended for broadcasting and the other not and as for me fraps output is intended to be sent to an editor in my usage.